Stomper PCB/Panel/MCU


STOMPER is a percussion generator that uses an unfiltered square-wave oscillator. Quickly sweeping the oscillator results in a satisfying high-q-sounding zip and thud thanks to all the crazy harmonics.

PCB/Panel/Microcontroller kit. Other components not included. See BOM below for needed parts.



6 100nF Ceramic Disc Capacitors
4 10uF Radial Electrolytic Capacitors
3 100uF Radial Electrolytic Capacitors
2 20pF Ceramic Disc Capacitors
1 100R Resistor
9 1K Resistors
1 2K Resistor
5 10K Resistors
ATMEGA328P-PU DIL Microcontroller (supplied)
TL071P Opamp DIL08
2N3904 NPN Transistor
7805L TO92 5v 100ma Power Regulator
2 1n4007 Diodes
16 1n5817 Schottky Diodes
5 10kB Potentiometer 16mm PCB mount
3mm LED + bezel (for 6mm hole).
16MHz crystal
5×2 Header (Eurorack Power)
(optional) 1×4 Header (Programming)
8 3.5mm Kobiconn-style sockets with lugs
DIL28-3 Socket
DIL08 Socket

Build Instructions
Build Instructions


-Glorious 1 bit audio.
-CV on all controls.
-Gate output for external ADSR (or whatever).
-Clock or trigger input.
-Clock/Trigger Divider.
-Arduino-compatible programming header, code provided.
-Unused I/Os broken out for hacking.
-8HP Eurorack.

All inputs can be CV controlled (0-5V), including the built-in clock-divider. It uses standard 10 pin +12/-12 power, drawing a paltry 30mA.

It’s triggered by sync-24 clock or trigger/gate. It has a handy gate output to easily (and accurately) apply an envelope to each hit whether it’s triggered or clocked (you can see the gate in action in the video below as it triggers the oscilloscope.) Output is 10Vp-p.

PDF Download Use and Build Instructions

Additional information

Weight60 g
Dimensions15 x 10 x 2 cm